MIC4827YMM Micrel Inc, MIC4827YMM Datasheet - Page 8

• Manufacturer Part Number: MIC4827YMM
• Description: IC EL DRIVER 180VPP OUT 8-MSOP
• Manufacturer: Micrel Inc
• Type: EL Lamp Driverr

Specifications of MIC4827YMM

• Lead Free Status: Lead free
• Frequency: 60 ~ 1000 Hz
• Current - Supply: 21µA
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Supply Current: 21µA
• Meter Display Type: Electroluminescent Lamp
• Supply Voltage Range: 1.8V To 5.5V
• Driver Case Style: MSOP
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Current - Output: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-1803-5; MIC4827YMM

Switching Frequency
The switching frequency of the converter is controlled via
an external resistor between R
device. The switching frequency increases as the
resistor value decreases. For resistor value selections,
see the “Typical Characteristics: Switching Frequency
vs. Switch Resistor” or use the equation below. The
switching frequency range is 8kHz to 200kHz, with an
accuracy of ±20%.
EL Frequency
The EL lamp frequency is controlled via an external
resistor connected between R
device. The lamp frequency increases the resistor value
decreases. For resistor value selections, see the
“Typical Characteristics: EL Frequency vs. EL Resistor”
or use the equation below. The switching frequency
range is 60Hz to 1000Hz, with an accuracy of ±20%.
Micrel, Inc.
July 2009
Figure 2. 108Hz Typical Output Waveform
f
f
SW
EL
( )
Hz
(kHz)
R
EL
=
360
(
R
M
SW
Ω
TIME (2ms/div)
36
)
(
M
Ω
)
EL
SW
pin and V
pin and V
DD
DD
V
L = 220µH
C
Lamp = 2in
R
R
pin of the
IN
OUT
SW
EL
pin of the
= 3.0V
= 3.32M
= 332k
= 0.033µF
2
8
In general, as the EL lamp frequency increases, the
amount of current drawn from the battery will increase.
The color of the EL lamp and the intensity are dependent
upon its frequency.
Enable Function
The enable function of the MIC4827 is implemented by
switching the R
V
switch and the EL oscillators are disabled; therefore the
EL driver becomes disabled. When these resistors
connect to V
EL driver is enabled.
DD
. When R
Figure 3. 180Hz Output Waveform
Figure 4. 360Hz Output Waveform
DD
SW
, both the oscillators will function and the
SW
and R
and R
TIME (2ms/div)
EL
EL
are connected to ground, the
TIME (2ms/div)
resistor between ground and
M9999-070709-A
[phone]
MIC4827
V
L = 220µH
C
Lamp = 2in
R
R
IN
OUT
SW
EL
= 3.0V
= 1M
= 562k
= 0.033µF
2